A voltage follower is used as 1. An isolation amplifier 2. A buffer amplifier Which of the above statements is/are correct?

Option 3 : Both 1 and 2

Voltage follower:

• A voltage follower is an op-amp circuit whose output voltage straight away follows the input voltage. i.e. output voltage equivalent to the input voltage.
• The Op-amp circuit does not provide any amplification thus, its voltage gain is unity.
• The voltage follower is used as a buffer amplifier, isolation amplifier, unity gain amplifier as the output follows the input.
• The voltage follower provides no alternation or no amplification but only buffering.

Characteristics:

• High input impedance
• Low output impedance
• Current Gain & power gain high
• Voltage gain unity